It I use the wax with the duratec in the last coat and I've had great results. Don't be afraid of adding a little extra wax, I've never had a problem doing it this way. I've been told you don't have to use wax with duratec but my experience says use the wax.
PVA is fine for small repairs but you don't need to deal with that if your doing larger areas.
Duratec makes a thinner. It's not cheap but it works great. I've never used lacquer thinner with gelcoat and I wouldn't myself. I've used styrene or patch booster to thin also with fine results.
OK - this will probably make some folks choke. I've used Pledge instead of wax additive or PVA on patch repairs I also thin with about 20% acetone to reduce orange peel (using a Preval sprayer). These ghetto techniques are just for small patching on hulls or foils.
Chris.
